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Extinction and the Electromagnetic Optical Theorem

DOI: 10.1615/ICHMT.2007.ConfElectromagLigScat.50
pages 9-12

Matthew J. Berg
US Army Research Laboratory, RDRL-CIE-S, Adelphi, MD ; and Mississippi State University, Department of Physics and Astronomy, Mississippi State, MS; and Kansas State University, Department of Physics, Manhattan, KS, USA

Christopher M. Sorensen
Kansas State University, Department of Physics, Manhattan, KS 66502-2601, USA

Amit Chakrabarti
Kansas State University, Department of Physics, Manhattan, KS 66502-2601, USA

要約

The energy flow caused by single particles is examined to form a physically based understanding for extinction and the electromagnetic optical theorem. The behavior of the energy flow is explained in terms of wave interference. The optical theorem is shown to be a relationship based on the relative phase between the wave incident on a particle and the wave scattered by it. The relative phase is determined by the refractive and absorptive properties of the particle and reveals how extinction depends on both scattering and absorption.

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